Posted by Rasim (A) on June 30, 2009 at 05:06:27

In Reply to: RE: Ella - right tube fiery orange glow posted by mikey115 on June 28, 2009 at 06:51:01

Could be that the coupling cap went bad and passed thru some DC to power tubes (KT88 etc). Very easy to dignose. Be careful V is high. With no input, measure DC on the power tube side of the respective cap. Place the black probe in the 0 of the speaker output at the back, use only one hand, dont touch anywhere else and with the red probe of voltmeter check the cap. If you cant figure out which side of the cap, check both, one side should not show any DC volt.

Hope this helps.

• RE: Ella - right tube fiery orange glow - mikey115 21:07:20 06/30/09 (2)
  In Reply to: RE: Ella - right tube fiery orange glow posted by Rasim on June 30, 2009 at 05:06:27

  thanks very much rasim for the suggestion. i hope to test the amp out this weekend. i will be very careful. i try wherever possible to use alligator clips. thanks again - any other tips from you, brian d. or anyone else will be appreciated.
  mike
  

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  • RE: Ella - right tube fiery orange glow - Rasim 05:03:33 07/08/09 (1)
    In Reply to: RE: Ella - right tube fiery orange glow posted by mikey115 on June 30, 2009 at 21:07:20

    
    
    

    
    I think your version is something like this one. If so, I tried to show you where to check for faulty coupling cap.
    
    
    Also pay attention to Brians comments if you have automatic bias control
    
    Regards,
    
    Rasim
    

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    • RE: Ella - right tube fiery orange glow - mikey115 18:54:12 07/08/09 (0)
      In Reply to: RE: Ella - right tube fiery orange glow posted by Rasim on July 08, 2009 at 05:03:33

      Hi Rasim,
      Yes its the same version. Last weekend turned out to be a working one so I couldnt check out the amp. Hopefully this weekend if all goes well.
      Thanks very much again Rasim for the help. I will post my findings.
      Cheers
      Mike
      

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